Azo dye.



' amino UNITED LdTATES PATENT OFFICE.

PAUL JULIUS AND CARL IMMERHEISEIM 0F LUDWIGSHAFEN-ON-THE-RHINE, GER-MANY, ASSIGNORIS TO BADISCHE ANILI-N & SODA FABRIK, OF LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, A. CDRIORATION.

Patented Sept. 23, 1913.

A20 DYE 1,073 ,QQ Specification of Letters Patent. n) Drawing.Application filed May 2a, 1913.

T 0 all whom it may concern Be it known that we PAUL JULIUS and CARLlMMnnnnIsnR, citizens, respectively, of the Austro-Hungarian Empire andof the German Empire, residing at Ludwigshafenon-the-Rhine, Germany,have invented new and useful Improvements in Am Dyes of which thefollowing is a specification.

We have discovered a new coloring matter which can be producedbycombining diazo-' tized meta-xylidin l-aminod.3-dimethylbenzene) withhenzoyl-1.8-amino-naphthol- 4.6-disulfonic acid, and which is veryvaluable in the form of its lakes.

One of the characteristics or our new coloring matter is that on gentlereduction with stannous chlorid and hydrochloric acid, it gives rise tometa-xylidin and an compound of benzoyl-LS-aminm naphthol-4.6-disulfonicacid.

The following example will serve to illustrate further the nature of ourinvention, which, however, is not confined to this example. The partsare by weight. tize 121 parts of 1ncta-xylidin (which may be done in theusual manner) and run the s lrtion, while stirring, into a solution ofparts of the disodium salt of benzoyl- 1.8-amino-naphtholefi-disulfonicacid, to which an. excess of sodium carbonate has been added. When thecombination is complete, heat the mass to about 80 C., add

Diazo- Serial No. 770,329.

' common salt, if necessary, and then filter off and press and dry thecoloring matter. It is a bluish red powder which dissolves in water, thesolution being brilliant-blue-red.

In the form of its alkaline earth lakes, it possesses brilliant blue-redshades.

The conversion into lakes can be effected in any manner usually employedforconverting coloring matters into lakes and can be carried out, ifdesired, without any inter mediateisolation of the coloring matter.

Now what We claim is i The new azo coloring matter which can he roduccdby combining diazotized metaxylldin with hcnzoyl-l.8-amino naphthol-4-.6-disulfonic acid, which consists when dry of a bluish red powderwhich yields a brilliant blue-red solution in water and in the form ofits alkaline earth lakes possesses brilliant blue-red shades, and whichupon gentle reduction with stannous chlorid and hydrochloric acid givesrise to meta-xylidin and an amino derivative of benzoyl-1.8-amino-naphthol-LG-disulfonic acid.

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

PAUL JULIUS. CARL IMMERHEISEB. Witnesses:

J. Anne. LLOYD, J osnrn Prmrrnn.

